T. D. A. Cockerell.
The Panurgine Bees of the Genera Hesperapis, Zacesta and Panurgomia.
Psyche 23(6):176-178, 1916.

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1 76 Psyche [December
costa slightly more than twice as long as the second; third three- fourths as long as the second; second vein ascending rather sharply to the costa; fourth vein curved at the base, but nearly straight beyond, fifth and sixth sinuous; seventh distinct, long. Halteres pale yellow.
One specimen from Kent, Me., August 19, collected by Mr. C. W. Johnson. Type in the collection of the Boston Society of Natural History.
This species is related to projecta Becker which also occurs generally through New England (Boston, Mass.; Brookline, Mass.; Hanover, N. H.), but differs by having the lower pair of proclinate bristles weaker and the palpi less noticeably enlarged in the male as well as by the absence of a fringe of hairs on the posterior fe- mora and the presence of only two scutellar bristles. It is also much like the European A. hortensis Wood, but the hypopygium is bristly.
THE PANURGINE BEES OF THE GENERA HESPERAPIS, ZACESTA AND PANURGOMIA.
BY T. D. A. COCKERELL,
University of Colorado, Boulder, Colorado. .
The genus Hesperapis Ckll., 1898, was based on H. elegantula Ckll. from New Mexico.
At the present time seven species are
assigned to it, the range of the genus being from New Mexico to Southern California. The following table separates the known forms :
Thorax above with moss-like ochraceous hair; abdomen dull ferru- ................................
ginous. elegantula Ckll.
...........
Thorax with ordinary pubescence; abdomen not red .1
....
1. Area of metathorax dull, or only the apical part shining. .2
.................
Area of metathorax polished and shining. .3
2. Mesothorax strongly and closely punctured, somewhat shining; ............ male about 11.5 mm. long.. eurnwpha (Ckll.) Mesothorax and scutellum shining, polished, finely punctured; ........... male a little over 6 mm. long.. .nitidula Ckll.
Mesothorax and scutellum dull, not evidently punctured semirudis Ckll.




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19161 Cockerell-Panurgine Bees 177
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3. Wings perfectly clear.
larreoe Ckll.
......................................
Wings brownish. .4
4. Wings milky at apex; legs of male wholly black ..... olivioe Ckll. Wings not milky at apex; male tarsi variably reddish rhodocerata Ckll.
The description of 9 rhodocerata, as originally given (Panurgus rhodoceratus, Trans. Am. Ent. Soc., XXIV, p. 148), included the $ of H. olivioe, which is separable with difficulty. The males are more distinct and the c? rhodocerata may be regarded as the type. Both species visit the flowers of Pectis in September. u Zacesta Ashmead, 1899, was described as a member of the Osmiinse, but Titus (Jn. N. Y. Ent. Soc., XII, p. 26) showed that it was a Panurgid. It comes from Los Angeles County, Cal., and is known only in the male.
Examining the type of Z.
rufipes Ashm. in the U. S. National Museum, I found that it closely resembled Hesperapis as typified by H. elegantula. The following characters are noteworthy :
(1) The moss-like ochraceous hair on thorax above, as in typical Hesperapis.
(2) The narrow face and essentially parallel orbits, as in H. ele- gantula.
(3) The orange flagellum, as in H. elegantula, but the scape shorter and stouter (sexual character?). (4) Clypeus has a broad yellow apical band, not seen in Hesperapis (but male of H. elegantula is' unknown). (5) Compared with H. elegantula has larger, shining, area at base of metathorax.
(6) Venation is as in H. elegantula, except that second submarginal cell is longer, and the lower section of basal nervure descends much 1es.s abruptly.
(7) The pygidial plate is long and narrow. (8) Titus has described the palpi of Zacesta; the first three joints of labial palpi are nearly equal whereas in H. elegantula the first is nearly as long as 3 plus 4, the second somewhat shorter than the first.
Hesperapis, as interpreted above, consists of at least two very distinct groups, one typified by H. elegantula (type of genus), and the other containing the remaining species. Zacesta is per-



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